Stopping mechanism for fabric-frame-moving mechanism



B. WETZSTEIN.

STOPPING MECHANISM FOR FABRIC FRAME movme MECHANISM. APPLICATION FILED MN. 25, H9.

1,339,049. v v Patenmd May 4, 1920.

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STOPPING MECHANISM FOR FABRIC FRAME MOVING MECHANISM. APIfLICATION HLED JAN. 25, I919.

Patented May 4, 1920.

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B. WETZSTEIN. STOPPING: MECHANISM FOR FABRIC FRAME MOVING MECHANISM. APPLICATION FILED JAN.,25. 1919.

1,339,049, V Patented m, 1920.

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BRUNO WETZSTEIN, OF NET IHAUSEN, SWITZERLAND.

STOPPING MECHANISM FOR FABRIC-FRAME-MOVING MECHANISM.

To all whom it may concern:

Be it known that I, BRUNO Wnrzsrnm, a citizen of Germany, residing at Neuhausen, in the Canton of Schaifhausen, Republic of Switzerland, have invented certain new and useful Improvements in Stopping Meclianism for Fabric-Frame-Moving Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of thisspecification.

Figure 1 is a plan view of the invention, parts being shown in section. r

Fig. 2 is a sectional elevation taken on the line 2-2 of Fig. 1, and

Fig. 3 is a section taken on line 33 of Fig. 1 in the direction in which the arrow points.

Fig. 4. is a perspective detail of the operative connection means for actuating the pawls showing particularly a construction of the lever m.

Fig. 5 is a sectional detail through certain' gears on the shaft 0"", and

Fig. 6 is a sectional detail through certain wheels on the shaft r.

The invention relates to a new mechanism for automatically controlling the position and moving'the fabric frame of embroidering-machin'es,and consists of the new combinations and arrangements of parts that are hereinafter more fully described and pointed out in the claims.

In automatic embroidering-machines the movements of the fabric frame usually are controlled by two driving gears working in a vertical and in a horizontal direction. These gears impart, by means of a collective gear, a movement to the fabric frame, which is the resultant of one or more group movements and which corresponds to the pattern. During the movement of the fabric frame all embroidering threads are slacked, but when the fabric frame is at rest, up to several thousand threads pull on the fabric stretched upon the frame and tend to move back the fabric frame. Stopping devices inserted in the driving gear have already been proposed to secure the fabric frame from moving back. 7 One of these devices consists in self stopping screws Specification of Letters Patent.

Patented May 4, 1920.

Application filed January 25,1919. Serial No. 273,188.

whose oflice is to move the fabric frame. Another device for the'said purpose consists of pawls arranged to engage the spur wheels transmitting the group movements and to secure the same from turning when they are at rest. Self stopping screws have the disadvantage, that in a short time, even when operated with the greatest accuracy, a play appears which exceeds the admissible limit, compensation being impossible on account of the irregular wear on the whole length. The spur wheel stopping device as heretofore used. has the same disadvantage I and still the other that the spur wheels are -too small.

The size of the wheels must therefore be kept within certain limits, since the stopping wheels simultaneously are the driving wheels. If the wheels were made as large as it would be desirable for stopping wheels, the whole embroidering machine and especially the frame-moving mechanism would be unduly large.

The essence of the invention consists in providing special stopping wheels situated on the same shafts as the spur wheels receiving the group movements of the group rack frames. Thus the size and construction of the stopping mechanism will be independent of the said spur wheels.

In the construction as shown by the draw ings, the invention is applied to an automatic embroidering machine as describecil in Groeblis Patent No. 528632 of November 6, 1894:, but my present improvement can also be employed in combination with other types of automatic embroidering machines.

With reference to Fig. 2 of the drawings, the letter (1 represents the frame, in which four horizontal sliding group rack frames 7), b, e I) are arranged one over the other. These vframes are intended so far as this specification is concerned to be understood as the same structure as the frame 1, 1 1 .1 shown in Figs. 7, 8 and 9 of the said Patent 528632. Each group rack frame is capable of being alternately operated seven rods 1, 2, 3, 4, 5, 6, 7 (in Patent 528632 rods m, m m m each rod imparting to the respective frame a different stroke. Four rack frames 0 0, 0 C are transversely slidablc in the group rack frames 7), 7), 71 72 These rack frames 0 0, 0 0 are controlled by a jacquard cardby means of the shaft (Z, the coupling levers e e 6 the V-shaped links f, f,

TI 6 q 7 p f f and the Sl1Cl6S gt, 9", g g in such a manner, that either the front or the back rack of a slidable rack frame 0 meshes with the spur wheels h, h, h h receiving the group movement, in order to obtain a forward or backward movement. The spur wheels h are rigidly connected to the ratchet wheels 2' i i vI- situated outside the scope of the slides (y and. held by pawls j, j, j j (see Figs. 1, 2 and carried by the plate 76 and frame a. Each pawl j has a toothed segment and the segments of the pawls j and j mesh one with the other as also the segments of the pawls j and j. The pawls j, j are connected to a lever m by means of a link Z and the pawls j, j are connected to a lever m by means of a link Z which levers m and m" are rigidly fastened upon a shaft n carrying an arm m" to which is imparted an oscillatory movement by means of a cam (not shown) and a rod 0.

The wheels h and 2' are integral with a common sleeve 7" carrying at the lower end the yoke 29 of the lower collective gear. The yoke 12 contains the double gear 9, transmitting the desired rotary movement and that of the shaft r carrying the stopping wheel i the spur wheel h and the collective driving wheel 20 to the collective wheels s and thereby to the pinion a contained in the bearing 6 The pinion u meshes with the rack 01 connected to the fabric frame (not shown).

The construction of the upper collective gear is as follows: The spur wheel h and the stopping wheel are rigidly fastened upon the shaft r carrying at the upper end the differential driving yoke p in which the double gear g 9 is journaled. The spur wheel it, the stopping wheel 2' and the differential driving wheel 39 are rigidly fastened to the sleeve 1" journaled in the plate is and in the bearing The collective wheel 8 receives the movements produced by the groups III and IV, which movements are transmitted to the rack o and to the fabric frame (not shown) by the pinion a journaled in the bearing 2?.

By the addition of the special rotating stopping wheels of a diameter larger than the spur wheels, which stopping wheels recelve the movement of the group rack frames 6 b, b b it is possible to stop the gears imparting movement to the fabric frame, without play, during the stitch formmg period. The spur wheels if, h, h it and the stopping wheels 2', i 71 71 have the same number of teeth and are always when at all, advanced for a whole number of teeth according to the movements imparted from the rods 1, 2, 3, 1, 5, 6, '7. After the advancing movement of the spur wheels h, h", h it the stopping pawls j, j, j j", enter in the spaces of the stopping wheels,

z", i i i opposite to the pawls and prevent retrograde motion of the driving gear which otherwise would be produced by the fabric frame in the stitch forming period.

Starting from the initial position shown in Figs. 1 and 2, the shown movable parts perform the following movements:

The rod 0 (Fig. 1) is moved toward the left by a cam not shown. Lever m rocks theshaft n, which in turn swings levers m in such a way, that the links Z will be lifted and the pawls j released from the ratchet wheels 2' The gears imparting movement to the fabric-frame are now ready for being moved. Durin this operation the direction of the movement of the fabricframe has been accomplished in the following manner: Each coupling arm f is submitted to the action of a jacquard-needle and will by means of parts not shown, be coupled electively by its right or left shank to a pin of the corresponding coupling lever e These levers GI'IV are moved by the shaft cl and by a known cam not shown. Consequently, depending upon whether the coupling arm f has been coupled by its right or left shank to a pin of the corresponding coupling lever 6 the fore or back rack of the rack frames C will elec tively mesh with the proper wheel 71".

During the above described operations, the amplitude of the movements of the fab ric frame will already be accomplished by the jacquard (not shown), each of the four sliding group rack frames b' having been either locked to the machine frame or coupled to a determined group slide not shown and actuated by a step lever. The horizontal sliding group rack frames 6 always move from none to seven teeth to the right, turn the wheels k from none to seven teeth farther to the right or to theleft, dependingupon whether the fore or the back rack of the rack frames 0 mesh with the wheels 72, and move the fabric-frame (not shown) to the predetermined place by the collecting gears 19-8 and the toothed shafts u journaled in the bearings t---#, and racks o -o to which the fabric frame is connected. If certain ones of the sliding frames b remain in their resting position shown in Figs. 1 and 2 the corresponding rack frames 0 do not advance the corre sponding wheels k the advance is therefore O teeth, and no fabric frame movement is provided for by these groups.

When the frames b have completed their stroke to the right, the locking rod is pulled to the right by the cam not shown and the pawls y' are moved into the facing spaces of the ratchet wheels z' by means of the leversm shaft 7% and links Z and prevent thereby the free additional move ment of the fabric frame and its driving gears above described.

When this is done, the shaft d moves to the initial position shown in Fig. 1 and the same takes place with the coupling levers 0 the coupling arm f the slides 9 and the rack frames 0 controlled by the slides 9. hen the initial position is reached, the rack frames 6 are returned to the position as shown without actuating the wheels h Owing to the fact, that the ratchet wheels are much larger as the driving wheels 71 the fabric frame with its moving gear may be locked with much more security than was possible heretofore, t. 6., with driving wheels h which at the same time served as ratchet wheels. It is advisable, to make the ratchet wheels very large in the diameter, because during the locking of the fabric frame, the embroidery threads are taken up and thus up to several thousand shuttle and needle threadstend with a very energetical pull to move the fabric frame and its moving gears from its position. Enlargement of driving wheels serving at the same time as ratchet wheels however would involve enlargement of all of the mechanisms for producing the fabric frame movement. This not only would cause undue dimensions of the embroidering automat, but would also be uneconomical, because the usual mechanisms perfectly sufiice, to easily and surely shift the fabric frame which is not under the tension of the threads during its movement.

The wear and tear of the stopping device is very little because the stopping wheels do not take part in the movements of the fabric frame. The new stopping device is not limited to the two-group driving system of a movement collective gear; one or more groups stopped as described may act upon a movement collective gear.

What I claim is:

1. In a mechanism of the kind described for moving the fabric frame of automatic embroidering machines in which the movement of the driving gear is effected by slidable rack frames arranged in groups and meshing with spur wheels, coactive members to stop the fabric frame driving gears during the stitch forming period, certain of the members being arranged to turn with the said driving gears, but which do not actuate the driving gears other than to effect a stopping movement thereof.

2. In a mechanism for moving the fabric frame of automatic embroidering machines in which the movement of the driving gear is effected by slidable rack frames arranged in groups and meshing with spur wheels, coactive members to stop the fabric frame driving gears during the stitch forming period, certain of the members being arranged to turn with the said driving gears, but which do not actuate the driving gears other than to effect a stopping movement thereof, the said certain stopping members being larger so that the operating stopping faces travel over a greater distance than the corresponding spur wheels.

In testimony whereof I have signed my name to this specification.

BRUNO VVETZSTEIN. 

